I'm pretty sure this is to do with the forum being HTTPS now to avoid the insecure login implemented in newer browsers. I get that stores and shopping sites should have it, but forums seems a bit on the over cautious side.
Avatars for example haven't been fixed and show as HTTP instead of HTTPS. Some other things are not updated to HTTPS on the forum and may be linking to external scripts on normal HTTP.
Nothing else has really changed here, except temporarily removing member map since it doesn't work without HTTPS now and requires some fiddling to get it working correctly again.